"He must have been trained by Count Dooku," Mace had said, "so you can
expect Makashi as well; given the number of Jedi he has fought and slain,
you must expect that he can attack in any style, or all of them. In fact,
Obi-Wan, I believe that of all living Jedi, you have the best chance to
defeat him."

Did he kill any Jedi in Massacre? Cause I was talking as Jedi killer...

But since you brought up his usefulness, an orbital strike could've saved sorry Dooku just the same.
Any OOM command battle droid could have carried out that task.

There have been almost no Jedi kills in this show that are not associated with either Maul or a Bounty Hunter.
Dissing Massacre for a Grievous win is like Dissing Umbara for not being Rex-centric enough.